$$ In the bottom viz,

o Create a parameter called dropped call threshold. Give a range between $0$ and $0\mathrm{.}3$ with $0\mathrm{.}01$ step.

o There is only a label in cells that have a positive percentage of dropped call

$$ Hint: If dropped call percentage $>$ dropped call threshold then dropped call percentage else NULL

o The bottom viz is a heatmap using date string, tower name, and Positive dropped calls

o Adjust the color scheme of the positive dropped calls and add another positive dropped calls to labels.

o Finally, change the marks to square instead of automatic.